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金属纳米粒子的尺寸和形状对其物理和化学性质有很大影响,通常利用昂贵的透射电子显微镜和扫描电子显微镜进行其尺寸测量。为了节约测量成本,利用时域有限差分法研究了金纳米棒的尺寸与吸收峰的对应关系得到间接的测量方法。即当金纳米棒的纵横比增大时,横向等离子峰几乎没有变化,纵向等离子峰出现明显的红移,且红移速度随着金纳米棒半径的增大而增大。实际制备了两种不同尺寸的金纳米棒样品,通过理论模拟确定的金纳米棒的尺寸与利用透射电子显微镜测量的金纳米棒的尺寸符合的很好。 相似文献
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使用532nm,8ns激光脉冲研究了两种新型的基于富勒烯C60结构体系的金纳米粒子合成物的光学非线性.Z-scan实验结果和理论分析的比较表明,材料的非线性吸收强烈地依赖于材料中的配合体,而非线性折射主要来自金纳米粒子的贡献.而且与熟知的C60甲苯溶液光限幅特性作了比较,分析了光限幅机理.
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60结构体系')" href="#">基于富勒烯C60结构体系
金纳米粒子
等离子体
光限幅 相似文献
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依据Z-scan技术,使用波长532nm的纳秒脉冲,研究了通过聚焦的飞秒脉冲诱导并辅以热处理得到的金纳米粒子析出的玻璃的非线性吸收.观察到金纳米粒子析出的玻璃具有饱和吸收特性.根据局域场效应,对实验结果拟合,得到在接近表面等离子体共振激发情况下,金纳米粒子三阶极化率虚部分别为Imχ(3)m=57×10-7esu.玻璃样品中金纳米粒子的非线性响应主要起源于热电子贡献.
关键词:
带内跃迁
带间跃迁
热电子贡献 相似文献
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The third-order optical nonlinearities of dimethyl sulfoxide(DMSO) are investigated using the optical Kerr effect(OKE) and Z-scan techniques with femtosecond pulses.We are able to fit the OKE signal theoretically by convolving the autocorrelation of the incident pulse intensity profile with the impulse responses of the samples,illustrating the instantaneous nonlinear response of DMSO.We verify that the purely electronic cloud distortion causes the observed signal for DMSO.The Z-scan technique is used to estimate the third-order susceptibility of DMSO,which is about a quarter of that for CS2 and mainly comes from the nonlinear refraction with an intensity of less than 140 GW/cm2. 相似文献
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Measurement of Ultrashort Laser Pulse Width in a Wide Spectrum Range Using Dimethyl Sulfoxide by Optical Kerr Effect Technique 下载免费PDF全文
We illustrate that applying the optical Kerr effect technique to dimethyl sulfoxide (DMSO) can determine the width of laser pulses in a wide spectrum range that is transparent. Different from many other simple molecular liquids, such CS2, and toluene, DMSO responds to both 130 fs 800 nm laser pulses and 248 fs 400 nm laser pulses with electronic motions only. Therefore, the observed signal as a function of time reflects the temporal distribution of the intensity. We verify our illustration by both the autocorrelation technique and spectra analysis. 相似文献
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The dipole resonances of gold nanocages were investigated theoretically using finite difference time domain method.The results show that field enhancement is obtained at the walls of the gold nanocages.It is believed that the effect can cause a strong optical nonlinear property.To test the hypothesis,nonlinear absorption was investigated using a broadband 5 ns Z scan.It was found that at low intensities the sample shows saturable absorption(SA),while at higher intensities a switch from SA to reverse SA occurs.Moreover,the nonlinear absorption of the sample is sensitively wavelength-dependent,and,in the resonant region,saturation intensity is the largest. 相似文献
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